Grinding-machine.



w. '0. PLATT.

GRINDING MACHINE. APPucATloN FILED Nov. 23, 1914.

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*R N j W. 0. PLATT. GRINDXNG MACHXNE.

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'Paene Aug. 3, 1915.

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WLBEB PLA'IT, OFAOIL CITY, PENNSYLVANIA, ASSIGNUR T0 JOSEPH REID GAS ENGINE COMPANY, 0F GIL CITY, PENNSYLVANIA.

GRINDING-MACHIN E.

Application filed November 23, 1914. Serial No. 873,604.

To aZZ'eciom it may concern Be it known that L lVILnER 0. PLATT, a citizen of the United States, residing at Oil City, in the county of Venango and State of Pennsylvania, have invented certain new and useful improvements in Grinding-vachines, of which the following is a specilication.

This invention relates to grinding machines and particularly to that class of grinding machines having twin grinding wheels.

'.lhe primary object oi' the invention is to provide an exhaust attachment for machines embodying the features above outlined'in which a single unit exhausting device will serve two or more grinding wheels in anl clicicnt and advantageous manner.

Another object ,of the invention is to provide a mounting for the machine having the settling chan-limer below and the fan chamber above, with the grinding table surrnounting the whole organization.

Another object of the invention is to provide an accelerated drive for the exhausting means independent of the grinding means. l

lilith these and nziinoi.' objects in view the invention resides .in an" arrangement embodying the essential features of construction and cooperative relationship exemplii'ied by the illustrative embodiment shown on the accoi. pani/fing drawings, and particularly pointed ont in the subjoined claims.

ln said drawings, Figure l is afront elevation of the machine; Fig. 2 is a side eleva,- tion of the same; Fig. 3 is a vertical section oi the'machine'. and Fig. Il is a horizontal eftion on 'the lines "4, Fig. l, looking in Y the direction of the arrows.

Referring to the drawings in detail, 1 represents a shaft having lined' thereon at an intermediate point, a pulley 2, driven lfrom any suitable source of lpower, and at its ends, a pair of grinding wheels The shaft mountings 4. are located on either side of the intermediate pulley 2, and between said nullevand the respective wheels/3. The ta.- ble supports the shaft mountings, but terminates short of the grinding wheels and independent hoods 6 envelop the grinding when i., said hoods having an opening in grinding `position tothe wheels and construct@ with dust legs 7 below the table 5 terminating in settling traps 8 with removn Snecication of .Setters atent.

Patented fitug. 3, l.

able closures and vcommunicating laterally with, an air trunk 10 extending across the entire machine. Two rests 1l project upwardly'from the table in position to support work piieceeIin grinding position before the wheels.' A base l2 ber 13 and has mounted upon it a frame .lli which spaces the table above the base and provides a fan space between the table and the settling chamber. An air conduit l5 leads from the air 'trunk l0 to the eye of the fan 16 and the fan discharges into the'set tling chamber i3 through the discharge pipe 17. An accelerated drive between the grinder shaft and the fan is provided by the large pulley 18 on the grinder shaft l and the smaller pulley l9 on the fan shaft 2O connectedv by the belt 2l.

F rom the foregoing descriptionit will be readily seen that the arrailgement and disposition of the parts are particularly ingenious in an organization. involving a sin gie unit exhausting means serving a twinv grinding machine.

Another advantageous result obtained by the embodiment outlined above is by having the fan rate from the grinder shaft. The shaft necessarily have 'to be contains a settling charm lengthened as the pulley 18 which drives the fan 16, can be made in one piece with the pulley 2 which drives the grinder shaft 1.

By means of the accelerated drive for the fan 16 the suction produced in the air trunk 10 is such as will take care of all the dust,

regnlrdless of the speed of the grinder wheels. n other words, the fan l is at all times revolving at a greater rate of speed than the grinder wheels 13. y

I claim 1. In combination, a grinding machine having a base.y a frame supported thereon, a' grinding table supponted on said frame,

Ysuitable shaft mountings supported on said table, a shalt journaled in said mountings, a driving pulley on said shaft located intermediate said shaft inountings, grinder wheels mounted on the respective ends of said shaft; independent hoods partly enveloping the grinder wheelshaving dust legs terminating in settling trans, removable closures for said traps, a settlingchani'ber contained in said base, a fan supported thereon and communicating therewith, an air trueli: extending across the entire machine and' communicating with said dust and the 

